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comparison: layout/generic/nsPageContentFrame.cpp
layout/generic/nsPageContentFrame.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 #include "nsPageContentFrame.h" | |
| 6 #include "nsCSSFrameConstructor.h" | |
| 7 #include "nsPresContext.h" | |
| 8 #include "nsGkAtoms.h" | |
| 9 #include "nsIPresShell.h" | |
| 10 #include "nsSimplePageSequenceFrame.h" | |
| 11 | |
| 12 nsIFrame* | |
| 13 NS_NewPageContentFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) | |
| 14 { | |
| 15 return new (aPresShell) nsPageContentFrame(aContext); | |
| 16 } | |
| 17 | |
| 18 NS_IMPL_FRAMEARENA_HELPERS(nsPageContentFrame) | |
| 19 | |
| 20 nsresult | |
| 21 nsPageContentFrame::Reflow(nsPresContext* aPresContext, | |
| 22 nsHTMLReflowMetrics& aDesiredSize, | |
| 23 const nsHTMLReflowState& aReflowState, | |
| 24 nsReflowStatus& aStatus) | |
| 25 { | |
| 26 DO_GLOBAL_REFLOW_COUNT("nsPageContentFrame"); | |
| 27 DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus); | |
| 28 aStatus = NS_FRAME_COMPLETE; // initialize out parameter | |
| 29 nsresult rv = NS_OK; | |
| 30 | |
| 31 if (GetPrevInFlow() && (GetStateBits() & NS_FRAME_FIRST_REFLOW)) { | |
| 32 nsresult rv = aPresContext->PresShell()->FrameConstructor() | |
| 33 ->ReplicateFixedFrames(this); | |
| 34 NS_ENSURE_SUCCESS(rv, rv); | |
| 35 } | |
| 36 | |
| 37 // Set our size up front, since some parts of reflow depend on it | |
| 38 // being already set. Note that the computed height may be | |
| 39 // unconstrained; that's ok. Consumers should watch out for that. | |
| 40 nsSize maxSize(aReflowState.ComputedWidth(), | |
| 41 aReflowState.ComputedHeight()); | |
| 42 SetSize(maxSize); | |
| 43 | |
| 44 // A PageContentFrame must always have one child: the canvas frame. | |
| 45 // Resize our frame allowing it only to be as big as we are | |
| 46 // XXX Pay attention to the page's border and padding... | |
| 47 if (mFrames.NotEmpty()) { | |
| 48 nsIFrame* frame = mFrames.FirstChild(); | |
| 49 nsHTMLReflowState kidReflowState(aPresContext, aReflowState, frame, maxSize); | |
| 50 kidReflowState.SetComputedHeight(maxSize.height); | |
| 51 | |
| 52 // Reflow the page content area | |
| 53 rv = ReflowChild(frame, aPresContext, aDesiredSize, kidReflowState, 0, 0, 0, aStatus); | |
| 54 NS_ENSURE_SUCCESS(rv, rv); | |
| 55 | |
| 56 // The document element's background should cover the entire canvas, so | |
| 57 // take into account the combined area and any space taken up by | |
| 58 // absolutely positioned elements | |
| 59 nsMargin padding(0,0,0,0); | |
| 60 | |
| 61 // XXXbz this screws up percentage padding (sets padding to zero | |
| 62 // in the percentage padding case) | |
| 63 kidReflowState.mStylePadding->GetPadding(padding); | |
| 64 | |
| 65 // This is for shrink-to-fit, and therefore we want to use the | |
| 66 // scrollable overflow, since the purpose of shrink to fit is to | |
| 67 // make the content that ought to be reachable (represented by the | |
| 68 // scrollable overflow) fit in the page. | |
| 69 if (frame->HasOverflowAreas()) { | |
| 70 // The background covers the content area and padding area, so check | |
| 71 // for children sticking outside the child frame's padding edge | |
| 72 nscoord xmost = aDesiredSize.ScrollableOverflow().XMost(); | |
| 73 if (xmost > aDesiredSize.Width()) { | |
| 74 nscoord widthToFit = xmost + padding.right + | |
| 75 kidReflowState.mStyleBorder->GetComputedBorderWidth(NS_SIDE_RIGHT); | |
| 76 float ratio = float(maxSize.width) / widthToFit; | |
| 77 NS_ASSERTION(ratio >= 0.0 && ratio < 1.0, "invalid shrink-to-fit ratio"); | |
| 78 mPD->mShrinkToFitRatio = std::min(mPD->mShrinkToFitRatio, ratio); | |
| 79 } | |
| 80 } | |
| 81 | |
| 82 // Place and size the child | |
| 83 FinishReflowChild(frame, aPresContext, aDesiredSize, &kidReflowState, 0, 0, 0); | |
| 84 | |
| 85 NS_ASSERTION(aPresContext->IsDynamic() || !NS_FRAME_IS_FULLY_COMPLETE(aStatus) || | |
| 86 !frame->GetNextInFlow(), "bad child flow list"); | |
| 87 } | |
| 88 | |
| 89 // Reflow our fixed frames | |
| 90 nsReflowStatus fixedStatus = NS_FRAME_COMPLETE; | |
| 91 ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, fixedStatus); | |
| 92 NS_ASSERTION(NS_FRAME_IS_COMPLETE(fixedStatus), "fixed frames can be truncated, but not incomplete"); | |
| 93 | |
| 94 // Return our desired size | |
| 95 aDesiredSize.Width() = aReflowState.ComputedWidth(); | |
| 96 if (aReflowState.ComputedHeight() != NS_UNCONSTRAINEDSIZE) { | |
| 97 aDesiredSize.Height() = aReflowState.ComputedHeight(); | |
| 98 } | |
| 99 | |
| 100 FinishAndStoreOverflow(&aDesiredSize); | |
| 101 | |
| 102 NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize); | |
| 103 return NS_OK; | |
| 104 } | |
| 105 | |
| 106 nsIAtom* | |
| 107 nsPageContentFrame::GetType() const | |
| 108 { | |
| 109 return nsGkAtoms::pageContentFrame; | |
| 110 } | |
| 111 | |
| 112 #ifdef DEBUG_FRAME_DUMP | |
| 113 nsresult | |
| 114 nsPageContentFrame::GetFrameName(nsAString& aResult) const | |
| 115 { | |
| 116 return MakeFrameName(NS_LITERAL_STRING("PageContent"), aResult); | |
| 117 } | |
| 118 #endif |
